某电传操纵系统弹簧拉杆可调叉形接头断裂原因  

Cause of Fracture on Adjustable Fork Joint of Spring Pull Rod in a Fly by Wire Control System

作　　者：王京 欧阳康 许宜军 江怡南 WANG Jing;OUYANG Kang;XU Yijun;JIANG Yinan(State-owned Wuhu Machinery Factory,Wuhu 241007,China)

机构地区：[1]国营芜湖机械厂,芜湖241007

出　　处：《理化检验（物理分册）》2021年第3期68-72,77,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某飞机电传操纵系统弹簧拉杆可调叉形接头在运行过程中发生断裂,通过宏微观分析和金相检验等方法对拉杆接头的断裂原因进行了分析。结果表明:拉杆接头断裂为疲劳断裂,断裂的根本原因是其显微组织不均匀的同时出现了魏氏组织,使接头的抗疲劳性能严重降低,导致疲劳裂纹的萌生与扩展;而拉杆的受力不均匀则加速了其疲劳裂纹的扩展。The spring pull rod adjustable fork joint of an aircraft fly by wire control system fractured during operation.The causes of fracture on pull rod joint were analyzed by means of macro and micro analysis and metallographic examination.The results show that the fracture of pull rod joint was fatigue fracture,and the root cause of fracture was that the microstructure was not uniform and widmanstatten structure appeared at the same time,which seriously reduced the fatigue resistance of the joint,led to the initiation and propagation of fatigue cracks.Uneven stress on the pull rod accelerated the propagation of fatigue cracks.

关 键 词：弹簧拉杆 接头 疲劳断裂 魏氏组织 疲劳裂纹 

分 类 号：TG115.2[金属学及工艺—物理冶金]